The final attempt at using economic embargo as a political weapon before the War of 1812 was:

Boycott of the items and products of Britain.

Explanation:

The final attempt at using economic embargo as a political weapon before the War of 1812 was the Boycott of the products of Britain by the people of united states. this act was done to put pressure on the Britain government to lower the taxes but this act did not put pressure on the Britain empire and the taxes was not lowered so for that reason the war of 1812 was by the United states fought against Britain empire.

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.